The Theorem of Pythagoras

Adjust the dimensions of right triangle ABC by clicking and dragging any of the three vertices A, B, and C. Notice what happens the values of each side value squared.

Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now)

In a right triangle, a special relationship exists between the measurement of the legs and the hypotenuse. The sum of the squares of the two legs is equal to the hypotenuse squared. This is illustrated by using sides A, B, and C to create exterior squares.

Michael C. Powell, Created with GeoGebra